Quick-acting brace-chuck.



- PATBNTED DEC. 31, 1907;

M. A. BEARD. QUICK ACTING BRAGE CHUCK.

APP LIQATION FILED MAY 6, 1307.

iJNIiTED STAES MICHAEL A. BEARD, 0i CABOOL, ARKANSAS.

. QUICK-ACTING BRACE-CHUCK.

no. era-res.

Specification of Letters Patent.

Patented Dec. 31, 1907.

Aiaplication filed in; 6.1907. Serial in. 372.171.

To all whom it may concern:

Be it known that 1, MICHAEL A. BEARD, a citizen of the United States, residing at (a bool, in the county of Cleveland and State of Arkansas, have invented a new and useful Quick -Acting Brace Chuck, of which the following is a specification.

This invention has relation to quick-acting brace chucks and it consists in the novel construction and arrangement of its parts as hereinafter shown and described.

The object of the invention is to provide a spindle for the bracewhich is adapted to rc-- ceive between spaced portions the chuck jaws and which 15 rovlded with an interrupted thread whici is adapted to engage a similar thread located in the chuck socket. The chuck jaws are provided upon thcir outer sides with shoulders which lie in alincment with thesmooth or interrupted portions of the thread oi the spindle while the chuck socket is rovidcd in its interior with shoulders whic 1 lie in longitudinal alincment with the smooth ortions of the interior surface 0 the said soc et. The openin between the spaced portions of the spindie is provided with cross ins which are adapted to engage shanks at t e ends of the chuck jaws and a spring is interposed between the said jaws and is under tension with a tendency to hold the same away from each other.

By providin a quick-acting brace chuck the parts may be quickly adjusted to receive bit shanks of diflerent sizes and when the said shanks are inserted between the chuck jaws the chuck socket ma be turned into enga ement with the spinde for lirmly holding the bit shank between the chuck jaws. The spindle is pivotally mounted upon the brace proper and a ratchet mechanism provided whereby the said spindle may be rotated in one dircction only when a reciprocatory rotary movement is imparted to the brace.

In the accompanyiin drawings:-l igure 1 is a vertical soctionai view of the chuck. Fig. 2 is a similar view cut at a right angle to the view shown in Fig. 1, and Fig. 3 is a horizontal sectional view out on the line 33 of Fig. 1.

The s indie 1 is journaled at the cud ol the cranli ofthe brace '2. Said spindle is provided at its outer end with the oppositely dis osed spaced portions 3 which are provi ed upon their inner sides with the longitudinally disposed grooves l. The cross pins 5 are secured at their ends in the portions 3 and traverse the space between the same. The inner portion of the spindle 1 is provided with an interrupted screw thread 6, the interruptions of which occur in longitudinal alinement with the space between the portions 3 and the thread portions are therefore, in alincinent with the outer'side of the said s iaced portions 3. The inner end of the spindle 1 is provided with a ratchet wheel 7. The chuck jaws 8 are provided upon their inner faces with the longitudinally disposed grooves 9. Each said jaw is provided at its upper portion with a lateral swcll which terminates in a shoulder 10 locatcd upon the outer side of the jaw. The lower end of each jaw is provided with a shank 11 and the said shanks are adapted to en age and pass under the cross pins 5 and hoTd the jaws 8 against longitudinal movement with rclation to the spindle but which permit the outer ends of t 1 atcrally.

The spring 12 is interposed between the jaws S and is under tension with a tendency to hold the outer ends thereof spread apart. The chuck socket 13 is provided upon its interior with the interrupted thread 14 and the smooth surfaces 15 from the sections at which the thread is intcrru )tcd. adapted to cngagc the thread 6 or the said thread H may slip longitudinally along the t iis arrangement it is apparent that a quick acting brace chuck is provided which may be speedily adjusted to receive bit shanks of varying sizes. In as much as the surfaces 15 are in alincmcnt with the smooth sections of the interior of the chuck socket 13 and the shoulders 10 of the chuck jaws 8 extend transversely across the plane in which the smooth sections or interruptions of the thread 6 lie the chuck socket cannot be disengaged entirely or removed from thespindle 1 by a straight longitudinal movement. It requires a longitudinal movement sufficient to carry the thread 14 beyond the thread 6, then the socket 13 must be given a quarter turn in order to carry the thread 13 o posite thc. spaced portions 3 and from un er the shoulders 10 of the chuck jaws, when the said chuck socket may be slipped off the shank.

'lhc pawls 16 are pivoted upon the brace 2 in contact with the ratchet wheel 7 by the.

The thread 14 is and are held toward each other and normally c jaws to swing s )accs or interruptions ol' the thread 6. By

718 is located ootwssn be turned so ass to one 01' the otho? of the pswis out of weat with "she said ratchet Wheel. )is is done is continuous rotary movedirection may be imported to hile she brsoe is rotated alterr osito directions. The chuck id in. oontsot therswhen the thread with the screw M sosmg ohuci: soczzet ooxwwszng s spaced, portions, said spaced portions boinn 1n longitudinal slinsmont' with the $11 so so portions, ososs pins lying between the spaced portions, chuck jsWs having hooked shanks which pivomliy and detachsbljr engage the cross plns, said jaws having shoulders upon their outer sides and o chuck socket having 25 upon its intori'orlsn, intergu ted. thread for en agem'snt with Has thros of the spindle. 11 testimony that T'lsi'm zho foregoing as my own, I have hereto afiixod my signature in the prssenoe of two witnesses.

MICHAEL A. BEARD. Witnesses:

S. A. BRYAN'I,

WALTER ANDREWS. 

